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Guarantees, commitments and contingencies (Tables)
 6 Months Ended
Jan. 31, 2018
Commitments And Contingencies Disclosure [Abstract]  
Product Warranty Liability

The following table presents our product warranty liability as of January 31, 2018:

 

 

 

As of

 

 

 

January 31,

 

(in millions)

 

2018

 

Beginning balance

 

$

5.3

 

Provision

 

 

3.1

 

Warranty activity during the period

 

 

(3.2

)

Ending balance

 

$

5.2